INJURIOUS INSECTS AND FUNGI. 



281 



when they die, leaving the young or eggs protected by 

 their dead bodies. 



FIG. 164. OYSTER-SHELL SCALE. 



(Howard : " Year Book,' ? Dept. Agr., 1894, p. 257, Fig, 26.) 



Remedy. This pest may be destroyed by painting during 

 the winter with a very light coat of linseed-oil, by washing 

 with strong caustic potash, 1 Ib. to 2 qts. water, by strong 

 whale-oil soap, 2 Ibs. to 1 gal. of water, applied while the 

 trees are dormant, or by kerosene emulsion used just after 

 the young insects ha^e left the cover of the parent scale and 

 have a very delicate covering. 



The SAN JOSE SCALE (Aspidiotusperniciosus), Fig. 165, 

 so destructive to all kinds of fruit and many ornamental 



